Also found in: Thesaurus, Medical, Encyclopedia.


 (ē′kwə-tôr′ē-əl, ĕk′wə-)
a. Of, relating to, or resembling the earth's equator.
b. Relating to conditions that exist at the earth's equator: equatorial heat.
2. Being or having a mounting with two perpendicular axes, one of which is parallel to the earth's rotational axis, allowing a telescope so mounted to track a celestial object for long periods with adjustments only to that axis.
A telescope having an equatorial mounting.

e′qua·to′ri·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Mentioned in ?
References in periodicals archive ?
Transverse sections perpendicular to the axis of symmetry were usually done "equatorially," approximately halfway between base and apex, but sometimes additional cuts closer to the base or apex were made to intercept the germination openings and/or opercula or valves and to understand the positioning of lacunae.
Equatorially mounted Newtonians really need tube rotation, too, so that has to be added to the design.
(2011), wherein two measurements were performed in opposite equatorially areas of each fruit to measure the luminosity and tone of the skin.
We demonstrated that CPC activity (in the form of Aurora kinase function) is required for cytokinesis, and provided the first evidence that CPC and centralspindlin components both accumulate on equatorially aimed and overlapping astral microtubules.
The samples were equatorially scanned within a 2[theta] range (=20[degrees]-80[degrees]) at an increment of 0.1[degrees].
Cbl has the most complex structure of all known organic cofactors and its core structure includes a corrin ring in which the central cobalt atom is equatorially tethered to four nitrogen atoms.
Description: Pollen grain, monosaccate, bilaterally symmetrical, overall amb oval or oblong oval, corpus circular in polar view or sub circular or rhomboidal, the proximal face associated with a sharp, slightly curved (angular) monolete mark with thin labra, exine of corpus laevigate to infra punctate, on the distal side the attachment zone of the saccus is indicated by two folds which are faintly discernable in the figured specimen due to poor preservation, exoexine of saccus intrareticulate up to 2 m thick, muri 1.5-2 m wide, lacuni 3 x 5 m wide, saccus distally inclined, surrounding the central body equatorially, the lateral continuation of the saccus is usually broad, marginal limbus poorly developed.
The appearance of H-1 at [delta] 6.75 as doublet with small coupling constant (J = 3.6 Hz) indicated that it is equatorially oriented.
--Parawrightia is found in northern and southern tropical waters of the western Atlantic and sub equatorially in the eastern Indian Ocean, at depths of 0-12 m (Kelmo & Santa-Isabel, 1998; Grohmann et al., 2003), and salinity of 36.5 (Calder, 1993);